CAMARILLO, Calif. (AP) _ Gasoline prices dropped nearly 3 cents per gallon nationwide in the past three weeks, but the decline might stall if crude oil prices continue to rise, an industry analyst said Sunday.

The national weighted average, including all grades with taxes, was $1.1902 per gallon Friday, down 2.78 cents from the previously survey on May 21, said Trilby Lundberg, publisher of the Lundberg Survey of 10,000 stations across the country.

A good supply of domestic crude has helped shield American motorists from price hikes by OPEC and other oil-producing countries. But if crude prices continue to rise, U.S. pump prices might level off during the summer driving season, Ms. Lundberg said.

Gas prices dropped for 1 1/2 years until bottoming out in mid-February, when the average for all grades was 99.8 cents per gallon. That was followed by a hikes in the spring before prices topped out at an average of $1.2337 in early May.

At self-service pumps, the average for regular unleaded on Friday was $1.1320, mid-grade averaged $1.2333 and premium $1.3183.

For full-service, the average was $1.5159 for regular, $1.6031 for mid-grade and $1.6771 for premium.